Weatherproof laminated glass



Patented Billar.. 19,.` 19219.

UNITEDv'sTarEs 1,705,631 rant oFFicE.,

LOUIS kBARTELS'LONE, OFvBROOKLYN, NEW YORK, ASSIGNOR T0 INDESTRCTO GLASS.

CORPORATION, OF FARMINGDALE, NEW YORK, A CORPORATION F NEW YORK.

WETHERIEROOF LAMENATED GLASS..

Application filed October 26. 1927. Serial No. 228,981.

This invention is devoted to permanentizing a well-known article ofcommerce, to wit, so-called laminated glass. composed of two or more sheets of glass bonded to ,oneor moreintervening sheets of celluloid. l l

In manufacturing this Composite product, a remarkable adhesion of the contacting sheets can now be established through modern 1o methods; the adhesion being inherently capable of permanently retaining its full strength and uniformitysave at its margins where the Celluloid is unprotected by the glass. Itmay be noted, in this connection, that in the finishing step, it is usual to grind and, in some cases to polish, the edges to improve the appearance and to obtain accurate dimensions. Accordingly, at the edges of the laminated sheet, the edge of the Celluloid, through the normal course of manufacture, terminates flush with those of the glass.

When that product is put to certain industrial uses (for example as automobile wind-shields) it has been observed that a deterioration starts very slowlyA at the edges and very slowly extends inwardly; producing a defective margin of low adhesion and frequently of impaired optical appearance.

In an attempt to arrest this action, 1t has been customary to subject the composite sheet (the manufactured laminated glass) to a subl sequent operation, to wit, to paint or varnish the flush-ground edges and margins with a water-proofing film. This, however, has not provento have been an effective remedy for the difficulty for various reasons. The coating had to be thin because purely superficial and it had to be applied over the entirely exposed flush edges and exterior marginal region. Hence it was necessarily so located as t0 receive the full brunt of wear and irnpact, not only during transportation and handling, but likewise after being set in the frame ofthe wind-shield where it isexposed y to acontinual free-playing.

It has heretofore been supposed that traces of moisture creeping from the outside towards the inside were responsible for the spoilage,

but I have discovered that the spoilage canA This product is produces a microscopic separation and opens the way for a further evaporation, etc.

This invention now proposes to overcome Vthosefobjections by subjecting the edgeof providing an elongated groove-like moat between the marginsof the glass plates in the nature of ashielding housing for receiving a Celluloid-protecting composition. i

In the drawings, forming a part of this disclosure, Figure 1 is a sectional view of a portion ofa sheet of laminated glass. Fig. 2 is a similaiview showing the marginal portion of the'intermediate lamina removed to form a channel. Fig. 3 is a similar View onan enlarged scale, but showing the channel lined and filled 1in accordance with the present invention.

In performing the grooving, advantage is ool taken of the nature of laminated glass; to l wit, that the two panes of glass are spaced apart a few (say 20) thousandths of an inch by the intervening sheet of Celluloid which normally completely fills the space therebetween'. The marginal removal of the Celluloid admits, therefore, of being readily removed to a depth of abut a sixteenth of an inch; a. narrow chisel-like strip of steel being manipulated after the manner of a rabbeting plane. The glass sides will be found of aid -as guides for the point of the tool so that a thread-like marginal portion of the Celluloid may be scraped away quite readily to the depth required; leaving an.,elongated channel bounded at its bottom by the Concaved edge of the diminished sheet of Celluloid and bounded at its sides by the now-protruding rim-like margins of the undiminished planes of glass. This groove may be formed partly or wholly around the circumference of the laminated sheet according to its contemplated mounting,

Having thus preformed -the article, the weather-proofing may be applied. For that purpose, any good water-resisting Varnish may be used. Linseed oil is an excellent agent. The groove will be filled with the liquid and the exposed edges of the glass coated therewith. As it dries, the liquid shrinks and forms, if free from pigment or color, a transparent inconspicuous closely :idhering skin forming acomplete lining'for the groove. After the liquid has sufliciently hardened, the remaining unfilled portions of the channel may be loaded with any suitable filler to protect the water-'proofA skin and keep the channel from accumulating dirt. This filler may carry a tint '(asV lor'example red lead) and thus give the ornamental effect of a marginal stripe around the edges of the laminated sheet.

, As a result ot much investigation, involv- .ing long periods of testing, -it has been co'ncluded 'that the coating agent most suitable for this purpose can be made by the admixture of equal paits: 1st of rosin dissolved in turpentine, 2nd of boiled linseed oil, and 3rd of commercial japan drier. This forms a fluid that may be very readily brushed into the pre-formed groove and it will soon harden sufliciently to seal that grooveefliectively against internal evaporation of the celluloid and external admission ot moisture. As a supplemental filler, it has been found that paraflin wax dissolved in turpentineis excellent as it admits of being readily 'flown into the groove to intimately fill vall parts thereof and aiiialgainate superticially but well with the ahlgady applied coating. After the excess of the turpentine has evaporated, the wax retains its plastic qualities and hence has no tendency to crack open. Shoe-makers Wax is also practicable, as well as pitch or liquid asphaltum; but'the special compounds above detailed are deemed preferable.

A virtue peculiar to this construction is tliat it is proof against abrasion; the weatherproofing agent being physically sheltered by the glass and beyond reach, so to speak. Consequently the film cannot be broken by handling, will not be impaired by resting the edges of the heavy laminated'sheet upon rough supports, and will not become worn away by the weaving of such a sheet in its frame. Y

A distinct advantage of this method of Weather-proofing, and of the structural characteristics of this invention, is that it is unil plastic nature.

rif/omai Having',y thus revealed this invention, l

lclaim as newiand desire to secure the following coinbinationsand elements, or equivalents thereof,'by liet'ters Patent of United States l. An age-proofed sheet of laminated glass comprising an intervening sheet of organic material and external panes .of glass,"tlie edges ot the intervening sheet being spaced inwardly from those of the glass to form a narrow elongated channel; a weatlier-resisting film covering the edge of the sheet. and the iiinei surfaces ofthe protruding margins of the glass panes; anti' a channel-filler of a Q. Ainethod of age-proofing a sheet of laminated glass which consists in providing a narrow elongated channel between the inner lamina -and the i'im-portioiis of' the outer laininac; applying to the bottom and sidewalls of said channel a filmf`orming liquid;

and subsequently filling the residual channel with a normally plastic agent dissolvedl in iurpentine.

A perinanentized sheet ot laminated glass comprising an intervening sheet ot organic material and external panes of glass,

the edges oi' the intervening sheet being'v spaced inwardly from those or' the glass tov form a narrow channel; a film of linseed oil,

and rosin covering the edge of the sheet and the inner surfaces of the protruding margins of the panes; and a wax filler for the residual channel. f,

4. A method of permanentizing a sheet oi laminated glass which consists in providing an elongated thread-like groove between' the inner lamina and the riiii-portions of the outer laminte; applyingaamalgamated iosin and linseed oil to the bottom and side-walls of said channel; and filling the residual channel. with wax softened with tuipentine.

In witness whereof, I -have hereunto subscribed niy naine.

LOUIS BARTELSTONE 

